Question

Sound travels in air if

• A. particles of medium travel from one place to another.
• B. there is no moisture in the atmosphere
• C. disturbance moves from one place to another
• D. both particles as well as disturbance travel from one place to another

Answer 1

The correct option is D

both particles as well as disturbance travel from one place to another

1. The disturbance created by a source of sound in a medium travels through the medium particles but there is no bodily motion of the medium particles.
2. The medium particles simply vibrate to and fro about their respective equilibrium positions and simultaneously transfer disturbance (energy) to the adjacent particles.
3. Consequently, the sound is heard or produced.

Hence, option (D) is correct.